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oceaneloulouros
@oceaneloulouros
January 2021
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Bonjour,
Pouvez-vous m'aider à cet exercice ?
Soit n un entier. On pose a n(n+3).
a) Exprimer (n+1) (n+2) en fonction de a.
b) Exprimer n (n+1) (n+2) (n+3) +1 en fonction de a.
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Geijutsu
Verified answer
Bonsoir,
a)
n(n+3) = n²+3n
Donc
(n+1)(n+2) = n²+2n+n+2 = n²+3n+2 = n(n+3)+2 = a+2
b) n(n+1)(n+2)(n+3)+1 = n(n+3)(n+1)(n+2)+1 = a(n+1)(n+2)+1 = a(a+2)+1 = a²+2a+1 = (a+1)²
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Bonsoir,a) n(n+3) = n²+3n
Donc (n+1)(n+2) = n²+2n+n+2 = n²+3n+2 = n(n+3)+2 = a+2
b) n(n+1)(n+2)(n+3)+1 = n(n+3)(n+1)(n+2)+1 = a(n+1)(n+2)+1 = a(a+2)+1 = a²+2a+1 = (a+1)²